Comptia Network+ Certification Exam Tutorial Florida
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by: endeavor
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Date: Tue, 9 Aug 2011 Time: 9:31 PM
As a CompTIA Network+ assay candidate, you’re apparently accustomed with DHCP – but just in case, we’re traveling to analysis DHCP basics actuality and again go into a altercation of DHCP Relay Agents.
When it comes to allotment an IP MCSE Exam abode to all the PCs on our network, forth with their arrangement mask, DNS server location, and more, we've got two choices on how to do it:
What we acquire actuality is the archetypal "static vs. dynamic" argument. I don't wish you to anticipate I'm lazy, but I'll yield the activating way of accomplishing things about every individual time.
You may admiration why it matters, back both methods absorb visiting anniversary workstation. You're appropriate about that, and even admitting it's a lot quicker to configure a workstation to get its IP abode and affectation from a DHCP server than it is to configure the absolute IP abode and affectation statically, the absolute allowances appear in if the arrangement changes.
And yield it from me - your arrangement will change. You'll abolish hosts, you'll add hosts, and if the antecedent arrangement administrator didn't plan for approaching growth, the day may appear if you've got to change the IP calculation arrangement for your network. The best that was fabricated originally amid changeless agreement and MCSE Certification DHCP will again actuate how simple the change will be.
If the arrangement was statically configured, you will now acquire to go to every individual workstation and change their IP acclamation to the new scheme.
If the arrangement is application DHCP, you artlessly change the networking arrangement on the DHCP server and acquiesce the workstations to get their new addresses dynamically.
Believe me, I've performed IP abode changes in both fashions, and I'll yield DHCP every time! Avoiding changeless IP abode assignments cuts down on the affairs of two hosts in your arrangement getting assigned the aforementioned IP address.
When hosts acquire an IP abode from DHCP, it does not accord to that host permanently. The abode is in fact busy from a DHCP server. Let's airing through the DHCP action from the host's point of view.
First, the DHCP Client boots up, and sends a DHCP Discover packet assimilate the network. The host does this in adjustment to "Discover" a DHCP server or servers. This Discover packet is a Level 3 broadcast, which has a destination IP abode of 255.255.255.255.
Every DHCP Server that hears this advertisement will acknowledge with a DHCP Offer, and it's an IP abode and affectation that is getting offered. The DHCP Action aswell includes a subnet mask, the IP abode of the DHCP Server sending the response, and how continued the host can accumulate this abode (the DHCP charter duration).
If assorted DHCP Servers appear to apprehend this broadcast, they will anniversary action an IP address.
The DHCP Client will acquire the aboriginal action it receives. It does so by sending addition broadcast, a DHCP Request packet.
A DHCP Relay Agent will advanced DHCP Requests to the DHCP Server. You can aswell configure a Windows server as a DHCP Relay Agent. Naturally, the Relay Agent have to be on the aforementioned concrete articulation as the hosts that cannot ability the DHCP Server - never put it on the aforementioned articulation as the DHCP Server itself.
Configuring a router as a DHCP Relay Agent is a lot altered than configuring a Windows server 70-297, and your Network+ assay will not crave you to configure either. You should apperceive why the charge for a Relay Agent exists, though, and should you charge to configure one on your network, consistently analysis the vendor's documentation.
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